Here is the full list of all 12 Carnivores: Dinosaur Hunter Reborn achievements.
Fill Trophy Room with 17 Tyrannosaurus Rex dinosaurs
Completely fill Trophy Room with dinosaurs
Start hunt with all equipment, all licenses and with a sniper rifle
Confirm 6 licensed dinosaurs of different kind during the same hunt
Hunt 25 dinosaurs using only one shot
Hunt 10 dinosaurs with only one shot using sniper rifle
Score more than 500 points for confirmed kill
Hunt 3 Ceratosaurus dinosaurs using the pistol
Travel marathon distance of 26 miles and 385 yards (42'195 m)
Hunt a Pteranodon with the crossbow
Hunt a dinosaur using only one shot with the rifle from at least 120 yards (110m)
Confirm your first kill